[T]he people in the physical reality are disturbed by the presence of people who are “somewhere else.”

But Google Glasses isn’t the only thing that can cause you to be two places at once, and to look weird in the physical reality while you inhabit a virtual one. Several people noted an earlier disturbing trend. Knowles2:

I remember when mobiles phones started to become popular use outside of business, mid to late nineties, people use to look at people funny when they saw them talking to themselves and couldn’t see the phones, often on buses.

And, of course, you have Ingress players standing outside post offices “charging resonators” and stuff. It can all be very disconcerting to those who are in the real world and not in the virtual one.